Using Quantity/Intensity (Q/I) Concept to Estimate Potassium Fertilizer for Sweet Corn Grown in Takhli Soil Series
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Abstract
The Quantity/Intensity (Q/I) concept can be used to assess soil K for efficient fertilizer management. Therefore, a study on K in the Takhli soil series was carried out using the
Q/I concept to estimate the suitable rate of K fertilizer for sweet corn, Insee 2, and Songkhla 84–1 cultivars in the greenhouse. The experiments were arranged in a randomized complete block design with 10 treatments, comprising no K fertilization, K fertilizer applied at the rate of 0.5, 1.0 and 1.25 time of K estimated from K activity ratio (ARke) with each of these rates being
applied as a single soil application, equally split soil application, and equally split soil and foliar application. The K rate at ARke was 25.58 mg K2O/kg. Results revealed that K fertilization estimated from ARke at all rates had no impact on yield of sweet corn, Insee 2 cultivar but increased fresh ear weight of sweet corn, Songkhla 84–1 cultivar in a similar manner, except the rate at 0.5ARke (P < 0.01). The rate of K added at ARke and 1.25ARke both similarly improved sweetness (22.0–22.7 and 13.0–13.7 °brix) and reducing sugar (121–141 and 102–120 mg/L) of sweet corn, Insee 2 (P < 0.01) and Songkhla 84–1 (P < 0.01) cultivars. The single soil application gave yield and most of sweet corn qualities better than did the equally split application when compared at the same rate. Soil after harvesting sweet corn statistically contained greater water-soluble K (P < 0.05) and exchangeable K (P < 0.01) except for the addition at the rate of 0.5ARke. Furthermore, K parameters estimated from the Q/I concept were statistically increased (P < 0.01). The ARke can be used to assess soil K availability for fertilizer management but it should be conducted further under field conditions.
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